Sewing machine comprises sewing machine rack with arm part and arm shaft, thread tension regulator having movable and fixed disks, retaining shank to hold and penetrate the disks and actuator with drive shank coupled to the retaining shank

摘要

The thread tension regulator (30b): is arranged outside of the arm part (13) along an exterior surface of the arm part; is arranged on a side of the arm part; and controls a resistant power. The front-end part of the arm part holds a vertically movable needle drive mechanism coupled on the arm shaft. The retaining shank (37) is arranged on an axle parallel to an axle of the arm shaft and the drive shank is arranged on the same axle as the retaining shank. The actuator is electromagnetically controlled and operates in axial direction of the retaining shank on the mobile disk (32a).